CVE-2026-115354

Medium

Description

Mistune before 3.3.0 contains a path traversal vulnerability in the opt-in Include directive that allows attackers to read local files by supplying relative or absolute include paths. Attackers who submit Markdown rendered via Markdown.read() can disclose files such as /etc/passwd and inject unescaped HTML or script content into rendered output.

SeverityMedium

CVSS6.5

Exploit probability—

ProductLepture Mistune

PublishedOct 22, 2026

First seenOct 22, 2026

Weakness typeCWE-22Path traversal

How to fix

Update

lepture mistune3.3.0 or later

Vendor advisories

github.com/lepture/mistune/security/advisories/GHSA-jhcm-5rpf-j3wv

Affected products

Product	Affected versions	Fixed in
lepture mistune	v < 3.3.0	3.3.0

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